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Investment Securities - Amortized Cost and Fair Value of Available-for-Sale Debt Securities by Contractual Maturity (Parenthetical) (Detail) | 3 Months Ended
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Mar. 31, 2014
Minimum [Member] | Corporate Bonds [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Available for sale security maturity period | 5 years
Minimum [Member] | U. S. Government Agency Bonds [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Available for sale security maturity period | 5 years
Maximum [Member] | Corporate Bonds [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Available for sale security maturity period | 10 years
Maximum [Member] | U. S. Government Agency Bonds [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Available for sale security maturity period | 10 years

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- Definition Available for sale securities maturity period. + References No definition available. + Details
Name: | pnbk_AvailableForSaleSecuritiesMaturityPeriod
Namespace Prefix: | pnbk_
Data Type: | us-types:durationStringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration